Автор: Neli78
Дата: 05-12-05 23:35
The principle
An old rule of thumb for photographers states that the longest shutter release time that can be used for sharp exposures without a tripod is the reciprocal value of the focal length (SI focal length). The DiMAGE A1 has a maximum focal length of 200 mm, the maximum shutter release time thus is 1/200 seconds. When releasing for longer durations, the image will be shaky and blurry.
With the Konica Minolta Anti-Shake system the camera is capable of detecting the movement of the camera and shifting the CCD in a way, that compensates for the movement of the camera in the duration of the exposure. This way, the exposure can take up to 8 times longer (3 clicks), than when shooting without Anti-Shake.
For a focal length of 200 mm, this means that photos with a shutter release time of 1/60 seconds can be taken, without loosing sharpness. This, on the other hand, means, that Anti-Shake has not only to be able to detect the movement of the camera in 1/60 seconds (0,017 seconds), but that it also has to calculate the necessary compensation and to shift the CCD exactly the calculated value.
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